CODEWITHSUNDEEP
c#string
anand
anand

Reputation: 1579

Inserting Special character at specific length in a string

I want to insert - in between them at 4 digits interval in the given string. In the string there will be no special characters and it is a controller code.

string char = "123456789012"

I want answer

string char = "1234-5678-9012"

Upvotes: 1

Views: 827

Answers (2)

Soner Gönül
Soner Gönül

Reputation: 98750

As a non-regex alternative, you can use Batch from MoreLINQ like;

string s = "123456789012";
var list = s.Batch(4, seq => new string(seq.ToArray()));
Console.WriteLine(string.Join("-", list));

Prints

1234-5678-9012

Upvotes: 0

w.b
w.b

Reputation: 11228

You can use Regex.Replace (combined with String.Trim to remove the trailing dash):

string str = "123456789012";
string res = Regex.Replace(str, @"\d{4}", match => match + "-").Trim('-');

Console.WriteLine(res); // 1234-5678-9012

Upvotes: 3

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